public static function activate_site() {

		// Add default values where needed.
		$options = array_merge(
			get_option( 'popmake_settings', array() ),
				array(
				'disable_popup_category_tag' => 1,
			)
		);

		// Setup some default options.
		add_option( 'popmake_settings', $options );

		add_option( 'pum_version', Popup_Maker::$VER );

		pum();

		// Setup the Popup & Theme Custom Post Type.
		// PUM_Types::register_post_types();.

		// Setup the Popup Taxonomies.
		// PUM_Types::register_taxonomies( true );.

		// Updates stored values for versioning.
		// PUM_Utils_Upgrades::update_plugin_version();.

		// We used transients before, but since the check for this option runs every admin page load it means 2 queries after its cleared.
		// To prevent that we flipped it, now we delete the following option, and check for it.
		// If its missing then we know its a fresh install.
		delete_option( '_pum_installed' );

		// Prepare to redirect to welcome screen, if not seen before.
		if ( false === get_option( 'pum_seen_welcome' ) ) {
			set_transient( 'pum_activation_redirect', 1, 60 );
		}

		pum_get_default_theme_id();
		pum_install_built_in_themes();
		pum_install_example_popups();

		// Reset JS/CSS assets for regeneration.
		pum_reset_assets();
	}